The Jolteon (13 / 144) card can be found in the Skyridge set.
Recently sold 3 times and based on those sales is worth around £34.03.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £0.01 to £125.73, making it highly volatile.
This Rare card was illustrated by Hikaru Koike.